a contractor has 420 man to finish a piece of work in 9 month how many extra man will be require to finish the work in 6 month?
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required man to finish work = 630 Man
in 9 month 420 man is required
So in 1 month 420×9 man is required
again in 6 month 3780÷6=630 man is required
in 9 month 420 man is required
So in 1 month 420×9 man is required
again in 6 month 3780÷6=630 man is required
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